like others have said in this thread, I think it must be a power issue as opposed to network.
That is where I was headed. I haven't had any comments regarding my comment on ev's, so let me elaborate. Where @nyev and I live in BC there is zero incentive for off-peak hours to charge ones electric car, unlike most states which have adopted time of use for electricity to attempt to shift the load on the grid and balance the system. Therefore, without incentive to change ones habits people will do what is most convenient- charge their car when they get home from work, the same time as they turn their electric heat on (there are many homes on the island without gas, and it has been cold in BC lately), turn the lights on, and start their microwaves, ovens, TV's, then put in a load of laundry etc. The reason for peak demand for electricity and the reason for the poor sound quality, I am assuming due to the increased noise on the lines moreso than actual reduced capacity- I think our infrastructure has eliminated the potential for brown-outs. Most or all here know about this, I am not saying anything you all don't know already, but maybe all aren't aware in my case at least when I plug in it is a 240/60amp breaker? Which is the same amount of electrical draw as 2 arc welders. Now imagine there are 3 neighbors on the same transformer as the OP, essentially 6 arc welders are being used the same time as he wants to listen to his tunes, and of course in addition to all of the other "peak use" electricity appliances listed above. What if it is 10 neighbors with ev's? Which is quite possible. It must have some effect on the quality of our electricity. The term "peak electricity use" did exist before electric vehicles, now it is even more of a factor.
Maybe grounding boxes will help, but that would be an expensive shot in the dark to hope it’s the solution! I’ll keep trying things.
It is definitely more cost effective to just not listen critically during 4-7 pm 😁